24-05-2014
Chemistry

contestada

How many atoms are there in 90.2 grams of selenium?

Respuesta :

Sabrina211 Sabrina211

25-05-2014

First calculate the moles of selenium by multiplying the mass x molar mass
90.2 × 78.96 = 7122.2 moles

Number of moles multiplied by avogadros number gives number of atoms
7122.2 × 6.022 × 10^{23} = 4.289×10^{27} atoms

Answer Link

Otras preguntas

what is the slope intercept form of 12x+4y=-12

John adds 2 oz of milk to an 18 oz cup of coffee that is 10% milk. What percentage of milk in the resulting mixture

any five problems related to employ ment in nepal

Productivity is more about rhythm and less about_____.

what is phototropic?

Work out the equation of the line that goes through (3, 2) and (-1, 10)

[tex]\sf 6-2x+5+4x[/tex] Last one! bye! Thanks!

using the diagram what is the intersection of plane ABCD and GC A. Plane EFGH B. Point D c. Point C D. Line CB

Fill in the blank in the following dialogue with the appropriate interrogatory word below. de livres as-tu? J'en ai cinq. A. Où B. Qui C. Combien D. Comment

I NEED HELP W THIS ASAP!!!!!